Rotation and impact tool



March 22, 1960 A. w. MOSHER ROTATION AND IMPACT TOOL.

Filed May 16, 1957 INVENTOR ABTgYOTT W MOSHER HIS ATTORNEY RGTATION AND IMPACT TOOL Abbott W. Masher, Portland, Maine, assignor to lingersoll-Rand Company, New York, N.Y., a corporation of New Jersey Application May 16, 1957, Serial No. 659,622

9 Claims. (Cl. 29-240) This invention relates to rotation and impact tools, and more particularly to tools for attaching an element to a workpiece by applying rotary and impact forces.

An object of the present invention is to provide a rotation and impact tool of relatively simple and compact design.

Other objects will become obvious from the following specification and drawings, in which Figure 1 is a side view of the entire rotation and impact tool,

Fig. 2 is a longitudinal view, partly in section, of parts of the rotation and impact tool,

Fig. 3 is a transverse section taken along the line 3-3 of Fig. 1, looking in the direction indicated by the arrows, and

Fig. 4 is an exploded viewof a workpiece, bushing, and pronged washer.

Referring to the drawings, the rotation and impact tool, as shown in Fig. 1, comprises, in general, a spindle portion 2 to which a rotary motor 4 and a reciprocatory motor 6 are attached. In the particular embodiment shown, the function of the spindle portion 2 is to screw a work element such as the bushing 72 into a threaded hole 75 of a workpiece 74 and then to lock the bushing in place by hammering a pronged washer 80 onto the bushing 72 so that the prongs 78 fit into grooves 76 in the bushing 72 and cut through the threads of the threaded hole 75 of the workpiece 74.

The rotary motion for screwing the bushing into the workpiece is provided by the rotary air motor 4 which has a driving connection for rotating the spindle 12.

he spindle 12 rotates an anvil 38 through a clutch connection therewith. The anvil 38 has a sliding connection with and rotates a connecting member 58. The bushing 72 is screwed on the forward end of the connecting member 58 for rotation therewith.

The reciprocatory motion for hammering the pronged washer onto the bushing is provided by the reciprocatory :air motor 6, which, through its hammer piston 100, delivers impact forces to a rod 90 extending axially through the spindle 12. The rod 90 strikes the anvil 38, which then moves forward to hammer the pronged washer 80 onto the bushing 72.

Referring now in detail to the construction of the rotation and impact tool, a tubular casing member 8 includes a chamber 10 in which a spindle 12 is mounted for rotation. The spindle 12 terminates at its forward end in the rearward jaw 14 of a clutch. The part of the spindle 12 immediately adjoining the clutch upper jaw 14 is in the form of a hexagonal shoulder 16, on which is mounted a beveled gear 18 for rotation therewith.

Also mounted on and encircling the spindle 12 is a spacer bushing 20 located between the beveled gear 18 and a ball bearing assembly 22. A nut 24 screwed on the rearward end of the spindle 12 holds the ball bearing assembly 22, the spacer bushing 20, and the beveled gear 18 tightly against the shoulder 16 of the spindle 12 for zszaisi Patented Mar. 22, 19 60 inc rotation therewith. The ball bearing assembly 22 is mounted in the rearward part of the chamber 18 and is held against a shoulder 30 on the inside ofthe tubular casing member 8. The beveled gear 18 is mounted for rotation in the chamber 10 of the tubular casing member 8 by means of a needle bearing assembly 32. The beveled gear 18 is in mesh with the bevel pinion on the shaft 26 of the rotary motor 4. The shaft 26 enters the casing member 8 through a tubular section 28 extending laterally outward from the rearward portion thereof.

The rotary motion of the spindle 12 is transmitted to the bushing 72 by means of the anvil 38 which has a shaft portion 40 mounted for limited longitudinal movement in a tubular stop member 42. The anvil 38 has at its rearward end a forward clutch jaw 36 which is movable into and out of engagement with the rearward clutch jaw 14 and is guided in such movement by a sleeve 34 attached to and eXtending forwardly of the rearward clutch jaw 14 on the spindle 12.

Although rotation of the anvil 38 can be manually halted by the operators stopping the rotary motor 4 whenever the work element is advanced a predetermined distance into the workpiece, in the particular embodiment shown, stop means are provided for automatically halting the rotation of the anvil 38 when the bushing 72 has been screwed to the desired depth in the threaded .hole 75. The stop means shown includes the stop member 42 which has at its rearward end an extraverted flange 44 which rests on the introverted flange 48 of a tubular holder 46. The rearward end of the holder 46 is screwed onto the forward end of the tubular casing member 8. A lock nut 52 locks the holder 46 in place on the tubular casing member 8. A cushion disc 58 rests on the flange 44 for cushioning the impact of the anvil 38 in the event that the anvil 38 is driven forwardly when the tool is not in a position to strike a work element. A relatively heavy spring 54 interposed in the holder 46 between the casing member 8 and the cushion disc 50 constantly urges the stop member 42 against the introverted flange 48 of the holder 46.

The anvil 38 has at its forward end a longitudinal cylindrical recess 56 in which is slidably mounted a connecting member 58. In the connecting member 58 is formed a longitudinally elongated slot 68. A pin 62 passes through the slot 60 andis anchored in the shaft portion 40 of the anvil 38, engaging the connecting member 58 against rotational motion but permitting limited longitudinal motion with respect to the anvil 38. The connecting member has a cylindrical longitudinal recess 64 in the rearward portion thereof. A spring 66, having one end in the recess 64 of the'connectmg member 58 and the other in the recess 56 of the anvil 38, and compressed therebetween, constantly urges the connecting member 58 outwardly from the recess 56 of the anvil 38 and 6urges the rearward end 68 of the slot 60 against the pin 2.

The connecting member 58 terminates at its forward end in a threaded arbor 70 on which the element to be rotated is screwed. In Figs. 2 and 4 an internally and externally threaded bushing 72 is shown, for illustration only, as-the element to be rotated and inserted into a workpiece 74. The bushing 72 has two diametrically opposed longitudinal grooves 76 cut into its external threads for receiving the prongs 78 of a pronged washer 80 which fits on a reduced collar 82 on the rearward end of the bushing 72.

Before being driven on the bushing 72, the pronged Washer 88 is pushed back onto a reduced collar 84 of sheaths when the anvil 38 moves forwardly with respect to the connecting member 58.

In the particular embodiment shown, there is formed through the spindle 12 an axial bore 88 in which is 'slidably mounted a rod 90 for transferrin'gimpact forces from the hammer piston 160 to the anvil 38 by striking the clutch forward jaw 36. The rod 90 must be sufiiciently longer than the bore 88 so that it can be struck by the hammer piston On the rearward end ofth'e tubular casing member 8 is screwed the reeiprocatory motor 6 which consists of a casing 92 having an axial bore M therethrough. The rearward end of the casing 92 is closed by means of a disc 96 which'is attached thereto. Slidably mounted in an enlarged portion 98 of the bore 94 is the greater-diametered portion 1&1 or" the hammer piston 1% for reciprocatory motion. The smallerdiametered portion 102 of the piston 1% has a sliding fit in the bore 94. Formed inthe forward end of the piston 1% is a recess'104 so that the piston 1% does not contact the nut 24 whenit strikes therod T95 In a boss 106 on the casing 92 is mounted a thumb valve 168 for controlling the air supply to the bore4 for reciprocating the piston 160. An air supply tube 110 is screwed into the boss 106 and communicates with a passage 112 which, when thethumb valve 168 is depressed, communicates with a passage 114.- Which communicates with the enlarged portion 98 of the bore'94.

Also formed in the casing 92 is a passage 116 which f atits forward eud'communicates withthe enlarged portidn98 by a port 118 locatedintermediate the ends of the enlarged portion '98 and at its rearward end by a port -129 located'at'the rearward end'of the enlarged portion 1.98. Thejpassage 116 "and the ports 1'13 "and 120 serve "toc'onduet'eompressediair' frdm the forward easier the "nlarged'portion 8tothe rearward end of the enlarged lpor'tion 98 foractuatinglthepiston 1'09 forwardly. On the "forward part "of the greater-'diametered portion 1&1 *of' the piston lbilis a pressuresurface 122 for driving the piston rearwardly. A port 124 exhausts the 'rearward end of the enlarged portion 98, and a' port'126 vents'f'r'oin the forward end of thebore94.

In operation, the 'pronged Washer 86 is first putin'to position on the bushing 72 with the prongs 78 in'the grooves 76. The bushing 72"isthen screwed into place on the arbor 70. The stop member 42 is placed against the surfaceof the'workpiece 74 with thebushin'g 72in position to bescrewed intothe threaded hole 75. When the operator starts the air rotary "motor t by depressing Tthe valve handle 128; the shaft 26"of the motor 4 rotates 'the'beveled gear 18 which by means of the connection at the hexagonal shoulder'16 rotates the spindle 12. "The spindle 12'by means of the clutch jaws Hand 36 rotates the anvil '38 which, in turn, by means of the 'pin 62rotates the connecting member 58. ThecQnnectirig member 58 rotates' the bushing 72 and screws "it intdthe threaded hole 75 inthe workpiece 74.

As the bushing 72 is screwed into the threaded hole :Inorder toinsert the prongs7'8 of the Washer-80 ml the way into. the grooves 76 of the bushing"72 to'lock the bushing 72 in place in the threadedwhole "75 in" the workpiece 7 the operator stops the rotary air motor"?! --'and opens the thumb valve 198 of the reciproeator'y' air motor 6. The compressedair'thenenters from thesupply tube 116 into the passage 112, flows through-the gthumb valve 108 mm the passage'114, and thence into the enlarged portion 98 of the bore 94. When the piston '"sa'i "motion, a connecting member engaged for rotation with said anvil and mov'able longitudinally with respect to said anvil, said" connecting" member being adapted to be connected to the work 'element' tobe rotated,- anda' stop member extending "beyond said casing and cooperating "with saidclutch means for causing disengagement there- 100 is in the "position 'shown "in Fig. '2, the compressed air enters through the port 118 into the passage 116 and fiows through the port 120 into the part of the enlarged portion 98 located rearwardly of the greater-diametered portion 101 of the piston 196. The compressed air, acting on the rearward end of the greater-diametered portion 101 drives the piston 100 forwardly to strike the rod 90, which, in turn, strikes the anvil 38. Any .air in the bore 94 is vented through the port 126 when the piston 10E) moves forwardly. The anvil 38 then moves forwardly, being guided by the sleeve 34 and the stop member 42, and itsshoulder '86 strikes the washer and drives the prongs 78 all the way into the grooves 76 of the bushing 72. The prongs 78 cut through the threads of the threaded hole 75 and lock the bushing 72 in place in the threaded hole 75. When the anvil 38 is struck by the rod 90, it moves forwardly with respect to the connecting member '58,"c0mpfessing the spring 66, and moving the pin 62 from the rearward end 68 of the slot '60'toward the forward end 69 of the slot 60.

When the gr'eater-diarnetered portion 191 of the piston has moved a sui'hcient distance forwardly to uncover tbeport 12-4 and to cover the port 118, the air rearwardly -of the piston is exhausted through the port 124, andthe compressed air in'the enlarged portion 98 acts on the pressure surface 122 driving the piston rearwardly. Several such blows of the anvil may be required to seat the Washer 80 on the bushing 72.

I To unscrew the arbor 7% of the connecting member 58 out or the bushing 72 after the bushing has been inserted 'into'the'threaded hole 75 and the washer 80 has been seated on the bushing 72, the operator presses the tool new against tlieworkpiece 74.- Ira-consequence, the

stop member 42 is moved back withrespect to the inreverted fiange 48' of the holder 46, compressing the spring"-54,"and the anvil 38 is moved back into clutch eng'agement with the spindle '12. The operator then star'tsdheirotary motor 4 in the reverse direction, which rotatesth'e anvil in the reverse direction and unscrews the-connecting member 58 from the bushing 72.

"I' claim: 1. A tool for'rotatingand hammering a work element, comprising a casing, a rotary motor mounted in said easing, aspindle disposed in said casing and having-a driving connection with said rotary motor, a reciprocatory motor mounted in said casing, an anvil disposed in {said casing and arranged to be urged by said recipro- '::atorymotor-for striking the'work element, meansI-en- "gaging said spindle and saidanvil for the transfer of rotary motion therebetween, and a connecting member engaged to the anvil for rotation therewith and movable =lo'n'gitu'dinally with respect to said anvil, said connecting member connectable to the work element to be rotated.

2. A tool for rotating and hammering a work ele- -ment,comprising a casing, a rotary motor mounted in 'sa'idc'asing,a spindle disposed in said casing and ar- 1 ranged to be driven by said rotary motor, a reciprocatory motor-mounted in said casing, an anvil disposed in said "c'asingandarranged to be urged by said reciprocatory for striking the work element, clutch means 5 on in'dleand saidanvil for disengaging andengaging indleand said anvil 'for the'transfer of *rot'ary motor of for limiting the advance of the work element intothe "workpiece.

3. "A tool for rotating and hammering a work element,

said reciprocatory motor, an anvil disposed in said casing and arranged to be urged by said rod for striking the work element, clutch means on said spindle and said member having a driving connection with the anvil connected for rotation with said anvil and movable longitudinally with respect to said anvil, said connecting member being adapted to be connected to the work element to be rotated.-

4. A tool for rotating and hammering a work element, comprising a casing, a rotary motor mounted in said casing, a spindle disposed in said casing and arranged to be driven by said rotary motor, a reciprocatory motor mounted in said casing, a rod arranged to be moved by said reciprocatory motor, an anvil disposed in said casing and arranged to be urged by said rod for striking the work element, clutch means on said spindle and said anvil for disengaging and engaging said spindle and said anvil for the transfer of rotary motion, a connecting member engaged for rotation with said anvil and movable longitudinally with respect to said anvil, said connecting member being adaptedto be connected to the element to be rotated, and a stop member extending beyond said casing and cooperating with said clutch means for causing disengagement thereof for limiting the advance 'of the work element relative to the workpiece.

5. A tool for rotating and hammering a work element to a workpiece, comprising a casing, a rotary motor mounted in said casing, a spindle disposed in said casing and arranged to be driven by said rotary motor, said casing having a chamber in a part thereof, a hammer piston reciprocable in said chamber, a passage and ports in said casing for cooperating with said piston for valving compressed air to the opposite end portions of said chamber for actuating said piston, a rod slidable in said spindle and arranged to be moved by said piston, an anvil disposed in said casing and arranged to be struck by said rod for striking the work element, clutch means on said spindle and said anvil for disengaging and engaging said spindle and said anvil for the transfer of rotary motion, a connecting member connected to the anvil for rotation with said anvil and having limited longitudinal motion with respect to said anvil, said con-' necting member having means for connecting said element to the work element for rotation thereof.

6. A tool for rotating and hammering a work element, comprising a T-shaped casing, a rotary motor mounted in the stem of said T-shaped casing which serves as a handle, a spindle disposed in one of the arms of said T- shaped casing and arranged to be driven by said rotary motor, a reciprocatory motor mounted in the other arm of said T-shaped casing, an anvil disposed in said casing and arranged to be urged by'said reciprocatory motor for striking the work element, clutch means on said spindle and said anvil for disengaging and engaging said spindle and said anvil for the transfer of rotary motion,

and a connecting member connected to the anvil for rotation with said anvil and movable longitudinally with respect to said anvil, said connecting member having means for engaging the work element to be rotated.

7. A tool for rotating and hammering a work element, comprising a T-shaped casing, a rotary motor mounted in the stem of said T-shaped casing which serves as a handle, a spindle disposed in one of the arms of said, T-shaped casing and arranged to be driven by said rotary motor, a reciprocatory motor mounted in the other arm of said T-shaped casing, an anvil disposed in the first said arm of the casing and arranged to be urged by said reciprocatory motor for striking the work eledisengagement thereof for limiting the advance of the work elment into the workpiece.

, 8. A tool for rotating and hammering a work element, comprising a casing, an anvil in the casing adapted to rotate and to strike a longitudinal blow on the work element, a rotary motor in the casing, means for connecting the motor with the anvil to rotate the anvil, a reciprocatory motor in the casing, and means for transmitting motion of said reciprocatory motor in one direction to said anvil for striking such blow, said anvil including a work connecting member connected .to the anvil for rotation therewith and movable longitudinally with re spect thereto. 7 t a 9. A tool for rotating and hammering a work element into a workpiece, comprising a casing, an anvil in the casing adapted to rotate and to strike a longitudinal blow on the work element, a rotary motor-in the casing connected to rotate the anvil, a reciprocatory motor in the casing, means for transmitting motion of said reciprocatory motor in one direction to said anvil for striking such blow, said anvil including a connecting member engaged for rotation therewith and movable longitudinally with respect thereto, and stop means for halting rotation of said anvil "whenever the work element is r advanced a predetermined distance relative to the workpiece.

References Cited in the file of this patent UNITED STATES PATENTS 1,009,248 Jenkins Nov. 21, 1911 2,438,744 Flynn Mar. 30, 1948 2,518,009 Hess Aug. 8, 1950 2,602,361 Meyer July 8, 1952 2,760,393' Stough Aug. 28, 1956 

